Question

我正在填充“用户详细信息”页面，此时，我以空用户身份登录，并且它一直在破坏，因为此查询必须返回一些内容。我想这样做，如果它是空的，它将返回＆＃34;＆＃34 ;;而不是打破。

我有一个模糊的想法如何做到这一点，但我需要帮助！当用户登录时查询肯定有效，因为我已经测试了代码，并且当有有效用户时它会填充。

我认为应该是这样的：

 @Override
        public UserDetails fetchUserById(int userId) {
            String query = "select ID, LOGIN_ID, EMAIL_ID, FIRST_NAME, MIDDLE_NAME, LAST_NAME, decode(is_primary, 1, 'true', 'false') IS_PRIMARY, decode(status, 1, 'true', 'false') IS_ACTIVE from user_details where ID = ?";
    List<UserDetails> strLst = return jdbcTemplate.queryForObject(query, new RowMapper<UserDetails>() {

                    @Override
                    public UserDetails mapRow(ResultSet rs, int rowNum) throws SQLException {
                        UserDetails userDetails = new UserDetails ();
                        userDetails .setId(rs.getInt("ID"));
                        userDetails .setIntranetId(rs.getString("LOGIN_ID"));
                        userDetails .setEmailId(rs.getString("EMAIL_ID"));
                        userDetails .setFirstName(rs.getString("FIRST_NAME"));
                        userDetails .setMiddleName(rs.getString("MIDDLE_NAME"));
                        userDetails .setLastName(rs.getString("LAST_NAME"));
   userDetails.setPrimaryAnalyst(Boolean.valueOf(rs.getString("IS_PRIMARY")));
                        userDetails.setStatus(Boolean.valueOf(rs.getString("IS_ACTIVE")));
                        return userDetails;
                }
    }, userId);

    if (strLst.isEmpty()) {
        return " ";
    } else {
        return strLst.get(0);

    }
}

这是我的查询代码：

 @Override
        public UserDetails fetchUserById(int userId) {
            String query = "select ID, LOGIN_ID, EMAIL_ID, FIRST_NAME, MIDDLE_NAME, LAST_NAME, decode(is_primary, 1, 'true', 'false') IS_PRIMARY, decode(status, 1, 'true', 'false') IS_ACTIVE from user_details where ID = ?";
                RowMapper<UserDetails> rowMapper = new RowMapper<UserDetails>(){

                    @Override
                    public UserDetails mapRow(ResultSet rs, int rowNum) throws SQLException {
                        UserDetails userDetails = new UserDetails ();
                        userDetails .setId(rs.getInt("ID"));
                        userDetails .setIntranetId(rs.getString("LOGIN_ID"));
                        userDetails .setEmailId(rs.getString("EMAIL_ID"));
                        userDetails .setFirstName(rs.getString("FIRST_NAME"));
                        userDetails .setMiddleName(rs.getString("MIDDLE_NAME"));
                        userDetails .setLastName(rs.getString("LAST_NAME"));
   userDetails.setPrimaryAnalyst(Boolean.valueOf(rs.getString("IS_PRIMARY")));
                        userDetails.setStatus(Boolean.valueOf(rs.getString("IS_ACTIVE")));
                        return userDetails;
                };
                return jdbcTemplate.queryForObject(query, rowMapper, userId);

        }

null用户读取的错误 HTTP状态500 - 请求处理失败;嵌套异常是org.springframework.dao.EmptyResultDataAccessException：结果大小不正确：预期1，实际0

Answer 1

您只需使用EmptyResultDataAccessException并返回空字段即可。像这样：

@Override
public UserDetails fetchUserById(int userId) {
    String query = "select ID, LOGIN_ID, EMAIL_ID, FIRST_NAME, MIDDLE_NAME, LAST_NAME, " 
                   + " decode(is_primary, 1, 'true', 'false') IS_PRIMARY, " 
                   + " decode(status, 1, 'true', 'false') IS_ACTIVE "
                   + " from user_details where ID = ?";
    try{
        RowMapper<UserDetails> rowMapper = new RowMapper<UserDetails>(){
            @Override
            public UserDetails mapRow(ResultSet rs, int rowNum) throws SQLException {
                UserDetails userDetails = new UserDetails ();
                userDetails .setId(rs.getInt("ID"));
                userDetails .setIntranetId(rs.getString("LOGIN_ID"));
                userDetails .setEmailId(rs.getString("EMAIL_ID"));
                userDetails .setFirstName(rs.getString("FIRST_NAME"));
                userDetails .setMiddleName(rs.getString("MIDDLE_NAME"));
                userDetails .setLastName(rs.getString("LAST_NAME"));
                userDetails.setPrimaryAnalyst(Boolean.valueOf(rs.getString("IS_PRIMARY")));
                userDetails.setStatus(Boolean.valueOf(rs.getString("IS_ACTIVE")));
                return userDetails;
            };
            return jdbcTemplate.queryForObject(query, rowMapper, userId);
        }
    }catch(EmptyResultDataAccessException e){
        UserDetails userDetails = new UserDetails ();
        //fill the userDetails fields with the empty values
        return userDetails;
    }
}

SQL查询 - 如果查询不成功，则需要能够返回任何内容

1 个答案: